In Powershell, what's the best way to join two tables into one?

Question

I\'m fairly new to Powershell, and am wondering if someone knows of any better way to accomplish the following example problem.

I have an array of mappings from IP a

Answer 1

You can use script block like this

$leases | select IP, NAME, @{N='MAC';E={$tmp=$_.IP;($reservations| ? IP -eq $tmp).MAC}}